TV ratings: 'Under the Dome' flat, but wins Monday night

"Under the Dome" was flat in ratings but couldn't be topped Monday night. Not even close.

Monday night's episode of the CBS thriller series drew 10.3 million viewers and a rating of 2.4 in the key 18-49 demographic, according to preliminary numbers from Nielsen.

The series, based on the Stephen King novel about a small town trapped under a mysterious transparent dome, was easily the highest-rated and most-watched telecast of the night, beating its nearest competition, NBC's "American Ninja Warrior," by 5 million viewers.

CBS won in ratings and viewership Monday with 6.18 million viewers and a 1.4 rating. Second place in ratings was NBC, followed by ABC, where the only original was "Mistresses."

"Under the Dome's" 18-49 rating was flat with last week, after it saw a double-digit drop-off from the prior week. CBS is still in a carriage dispute with Time Warner Cable that has left its channels dark for 3.2 million subscribers in Los Angeles, New York and Dallas.

"American Ninja Warrior" got a rating of 1.5 in the 18-49 demographic, down from last week. Also on NBC, "Get Out Alive with Bear Grylls" fell to a 1.2, but "Siberia" increased 11% in total viewership to 1.95 million viewers.